Lock nut



1946- 1.. w. SCHAPER 2,394,491

LOCK NUT Filed July 2, 1945 '75 4 k .4 I v r Q INVENTOR 150M480 h/ 56/ 54, 59, Fwy) I iwaww g Patented Feb. 5, 1946 I lie iasl'ii Figure 1 is aplan--viewof same is formed withthe c ntral screw threaded extension:

Figure 2 is a plan view of the friction lock nut.

Figure 3 is a side view of the same.

Figure 4 is a section on the line 4-4, Figure 2.

Figure 5 is a view similar to Figure 4, showing the nut engaged with the bolt and with the assembly or carrier.

Figure 6 is a side view of the friction lock nut, shown as used with the bolt and the insert in securing together two right angularly disposed plates, one of which plates is shown in section.

Figure 7 is a detail plan view of the insert.

In the drawing, the nut is shown as formed of a blank of resilient sheet metal such as cold rolled steel, said blank having a continuous series of petal like radial extensions 2 the radial length of which is greater than their breadth, said nut including a hollow body having flat sides 3 adapted to form a, wrench hold, a tapered top 4 having a central aperture 5, and a dished base 6 having a short central hollow cylindrical screw threaded upper extension I, located within said hollow bodyspaced from said top and the longitudinal axis of which is aligned-with the center of said aperture, said sides and said top being formed of said radial extensions bent upwardly from said base and constituting spring fingers 8, the free ends 9 of which define said aperture and are located in a plane (considering said spring fingers as of negligible thickness) at right angles to the longitudinal axis of said nut.

The central aperture 5 is of such extent thatthe spring fingers 8 will be forced outwardly against the peripheral portion of its dished base against a flat abutment surface ll of the assembly or carrier, said spring fingers will be further forced metastasis for ' and t a e having an arcuate outer free end 9.

In this process of manufacture, said central portion is dished as shown at 6 to provide a base or bottom for the hollow body of the nut and the material of the blank about said central perforation is extruded to form the short central hollow cylindrical upper extension I; the petal like radial extensions 2 are bent upwardly from said base to form the flat sides 3 and the tapered top 4 of said hollow body and to form the spring fingers 8 of which said sides and top are composed, and the hollow cylindrical upper extension 1 is provided with an internal screw thread ll.

In the use of the invention in means for securing together two right angularly disposed plates A and B of an assembly or carrier (Figure 6) one of the plates is provided with a notch l5, wherein is located the nut and the other plate is provided with a perforation loosely engaged by the bolt It, said bolt also loosely engaging a contracted entrance of said notch, and when screwed within the nut having the effect of drawing the nut against the outer edge wall' [5' of said notch to clamp the two plates together. i

In this use of the invention, an insert I8 is interposed between the dished base of the nut and the outer edge wall I! of the notch said insert providing the aforesaid flat abutment surface for the dished base of the nut and being provided with a central perforation II loosely engaged by said bolt home.

movement 01 escape ither l an the parts in proper relative position. the insert is provided with opposite lugs ll bent to engage opposite oi the flat sides 0! the not and with choc-i site lugs is bentto engage opposite sides 0! the notched plate marginal to i 191611;

I claim:

1. A"- friction lock hut formed entirely of resii lent sheet metal at the same thickness throughv out and the bionic tor which has a continuo a series of radial tapered petal iiko extens ons, the

radial length oi wh ch is: greater than th r breadth includinz a h llow body-harlot idos forming a wrench hold, atop providedlwith'a central opening, and a dished base having ashort hollow cylindrical screw the 1 l n itudinal axis of which is aligned w h ,F Fz center of said opening. said screw threaded can i tension being iccatcdwithih PM! sp ced som the i 1 too or said hollow body. said sides andsaid top 1 b ii s q d of said radiaizesteosions hent up ward y tro'm said ass ahdiconstitutios shrine vfingers t eef eejen. at which dciine said new 1 s. said spring fingers having at th ends thereof initial inoyahle engagement, withgthe r threads or a vtacit engaged with saidscrew I threaded extensicnand anal resilient. frictional j l c ing .csssscu entfwith said threads uses, il he 1 15 hi l -t sif fi s i QISRQQYWJQ 1 s gainsta fiat abutment suriacc. i

,2. Means, for; clainnin'stwo' right semen; dis= I sed plates together, one oi which plates ispro vide'd witha.notch having a contracted entrants;

and the other with a perforation; including a friction lock nut of resilient "sheet metal located within saidnotch and the blank for which is provided with a continuous series of radial petal-like extensions, the radial. length of which is greater than their breadth saidlpck nut nclpdi s a 1101- 2 low y h n fl side ic has wre h o -a"top"' provided with a "central opening, and a dished base having a short central hollow oylindrical screw threaded extension the longitudinal axis oi which is aligned with the center of said opening said screw threaded extension being 10- catedfiwithinhndzspaced from the top of said hollow sidesand said top being formed '01 said radial extensions bent upwardly from said and constituting spring fingers the free ends or which define said opening, said spring fingershaving-at their tree ends initial movable engagemoat thre ds 101:; awboltzensas nsssaid 12.0 screw -threaded.,- xtens1 n;'; ai c r d trance and said, perforation'.:%and:;1lnal;resilient v triotiohal lecith n: ncasement} with Saidifllteads uponfs iiewlns itheholt horne to press said dished base, oi, the nut: against a; flat-abutment-surface,

es an aninse t iu eroos dbetween said-dished b s of the not and hc uter-1edseiwailsorsaidvnotch. said insert providing saidflat abutment surface and having opposite n luss, bent,- into engagement with opposite oithc iiat sides of the nut. an l ith so opposite side; og ggidlnotchedplate-to secure the partsin p opcrrelativle p i i nr. 2' 

